Name: Potential High Water

Display Field: Crk_Nm

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: This layer is a subset of the floodplain_cfw_studies layer. As the City of Fort Worth (city) develops its urban flood risk identification tools, the city created Potential High-Water Areas (PHWA) across the entire City and ETJ areas for 1-, 5-, and 100-year storm events based on Atlas 14 precipitation data. These models were developed in HEC-RAS using a high-level Rain-on-Grid (ROG) analysis with the latest available 2019 LIDAR data and NOAA Atlas 14 rainfall data from the April 2020 iSWM manual to generate 1-, 5-, and 100-year outputs. The models were designed to account for the sub-surface storm drain network capacities using GIS asset information. Over 1,000 cross-drainage structures, not in the GIS asset information, were visually measured using EagleView software and incorporated into the models.This PHWA floodplain (shapefile) developed from this model was run through a GIS-based cleanup process to refine the boundary. These GIS steps aim to remove excessive noise, eliminate internal voids, evaluate isolated polygons, and smoothen the external polygon boundary to make the mapping output aesthetically pleasing and easier to use. The parameters used in the workflow process to perform the cleaning and smoothening steps were fine-tuned to work universally across all PHWA boundaries. Results were compared to the HEC-RAS ROG output data for general shape conformance and major approximations due to computer processing and the parameters were found to be universally acceptable for all PHWA areas across the city.

Copyright Text: Consultant: Pape-Dawson.

Default Visibility: true

MaxRecordCount: 2000

Supported Query Formats: JSON, geoJSON, PBF

Min Scale: 24000

Max Scale: 0

Supports Advanced Queries: true

Supports Statistics: true

Has Labels: false

Can Modify Layer: true

Can Scale Symbols: false

Use Standardized Queries: true

Supports Datum Transformation: true

Extent:

XMin: 2236806.864810748
YMin: 6859488.547209074
XMax: 2418904.2998397965
YMax: 7087684.072899035
Spatial Reference: 102738  (2276)

Drawing Info:

Renderer:
Simple Renderer:
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Outline:
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Label: N/A
Description: N/A
Transparency: 0
Labeling Info:

Advanced Query Capabilities:

Supports Statistics: true
Supports OrderBy: true
Supports Distinct: true
Supports Pagination: true
Supports TrueCurve: true
Supports Returning Query Extent: true
Supports Query With Distance: true
Supports Sql Expression: true
Supports Query With ResultType: false
Supports Returning Geometry Centroid: false
Supports Binning LOD: false
Supports Query With LOD Spatial Reference: false

HasZ: false

HasM: false

Has Attachments: false

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Type ID Field: null

Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID )
• FID_100YR_ ( type: esriFieldTypeInteger, alias: FID_100YR_ )
• Crk_Nm ( type: esriFieldTypeString, alias: Crk_Nm, length: 50 )
• RAS_Geom ( type: esriFieldTypeString, alias: RAS_Geom, length: 50 )
• Pol_Ar ( type: esriFieldTypeString, alias: Pol_Ar, length: 50 )
• Shape ( type: esriFieldTypeGeometry, alias: Shape )
• Shape.STArea() ( type: esriFieldTypeDouble, alias: Shape.STArea() )
• Shape.STLength() ( type: esriFieldTypeDouble, alias: Shape.STLength() )

Supported Operations:   Query   Query Attachments   Query Analytic   Generate Renderer   Return Updates

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